CN111023500B - Staged temperature control method for air valves of air handling unit in working condition of transition season - Google Patents

Staged temperature control method for air valves of air handling unit in working condition of transition season Download PDF

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Publication number
CN111023500B
CN111023500B CN201911311534.5A CN201911311534A CN111023500B CN 111023500 B CN111023500 B CN 111023500B CN 201911311534 A CN201911311534 A CN 201911311534A CN 111023500 B CN111023500 B CN 111023500B
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return air
valve
air valve
control
return
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CN111023500A (en
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范斯远
粟卫权
范子欣
易爵锋
池华武
唐秀帅
马冰
黄华鹏
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Suzhong Dake Intelligent Engineering Co ltd
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Guangxi Suzhong Dake Intelligent Engineering Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F24F11/47—Responding to energy costs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a staged temperature control method of each air valve of an air handling unit in the working condition of a transition season in the technical field of automatic control, which averagely divides the range from a return air temperature set value of the air handling unit to the maximum value of the return air temperature of an adjustable area of the air valve into two sections, and carries out different control methods on a fresh air valve, an exhaust valve and a return air valve when the return air temperature deviates from the set value and appears in the two different sections.

Description

Staged temperature control method for air valves of air handling unit in working condition of transition season
Technical Field
The invention relates to the technical field of automatic control, in particular to a staged temperature control method for each air valve of an air handling unit in a transition season working condition.
Background
The fresh air valve, the return air valve, the exhaust valve, the fan and the like are used as key equipment of the air handling unit, when the working condition is in a transition season, the cold/hot water valve is closed, the controller adjusts the opening of the fresh/return/exhaust valve through proportional integral operation according to the comparison between the return air temperature and a set value, and the outdoor fresh air is utilized as much as possible to keep the return air temperature constant.
When the fan operates, the air valve forms certain resistance (hereinafter referred to as wind resistance) in an air system, the larger the opening of the air valve is, the smaller the opening of the air valve is, the larger the wind resistance is, and the wind resistance has direct influence on the operating efficiency of the fan. In the known working condition of the transition season, the control of the new/return/exhaust valve of the air handling unit cannot fully consider the problem of the wind resistance of the system, and the optimal energy-saving effect cannot be achieved.
Based on the above, the invention designs a staged temperature control method of each air valve of the air handling unit in the working condition of the transition season so as to solve the above mentioned problems.
Disclosure of Invention
The invention aims to provide a stage type temperature control method of each air valve of an air handling unit in a working condition of a transition season, in order to further reduce the system wind resistance of the air handling unit and reduce the energy consumption of a fan, the invention changes the known air valve control mode into stage type control, and implements different control strategies in different stages, and the control strategies reduce the wind resistance of the system and reduce the energy consumption of the fan on the premise of maintaining the constant return air temperature and the constant air quantity, thereby solving the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the stage temperature control method of each air valve of the air handling unit in the working condition of transition season averagely divides the range from the set value of the return air temperature of the air handling unit to the maximum value of the return air temperature of the adjustable area of the air valve into two sections, and when the return air temperature deviates from the set value and appears in the two different sections, different control methods are carried out on the fresh air valve, the exhaust valve and the return air valve.
Preferably, the control method is
Stage 1: when the return air temperature value deviates from the set value and appears in a section between the set value and the staged control value, the maximum opening degree of the return air valve is kept unchanged, and the opening degree of the fresh air valve is adjusted to keep the return air temperature constant;
and (2) stage: when the return air temperature deviates from the set value and appears in a section between the staged control value and the maximum return air temperature of the air valve adjustable area, the fresh air valve is kept fully open, and the return air temperature is kept constant by adjusting the return air valve.
Preferably, in the control method, the exhaust valve is adjusted along with the fresh air valve, and keeps a certain opening difference with the fresh air valve, so as to maintain the micro-positive pressure in the room.
Preferably, the relational expression between the control output of the fresh air valve, the exhaust valve and the return air temperature is
The control output of the return air valve is as follows:
f(t)＝O3when (t)1≤t＜t2)
Figure BDA0002324655680000021
When (t)2≤t≤t3)
The control output of the fresh air valve is as follows:
Figure BDA0002324655680000022
f (t) 10, when (t)2＜t≤t3)
The control output of the air exhaust valve is as follows:
Figure BDA0002324655680000023
f(t)＝O4when (t)2＜t≤t3)
Wherein t is the actual value of the return air temperature, t1Is the set value of the return air temperature t3Is the maximum value of the return air temperature t of the adjustable area of the air valve2Is defined as a phased control value and has t2-t1＝t3-t2，，t、t1、t2、t3Is not only a sheetThe bit is the temperature in centigrade, O1Is the control output value O at the minimum opening of the exhaust valve2Is the control output value O when the opening of the fresh air valve is minimum3For controlling the output value, O, when the opening of the return air valve is at its maximum4Is the control output value when the opening of the exhaust valve is maximum, 10 is the control output when the fresh air valve is fully opened, and O1、O2、O3、O4And 10 in volts.
Preferably, the system also comprises an automatic control system for implementing the relationship between the fresh air valve, the exhaust valve, the return air valve and the return air temperature.
Preferably, in the automatic control system, a return air temperature signal t is acquired through a return air pipe temperature sensor and substituted into a relational expression of the control output of the fresh air valve, the exhaust valve and the return air temperature for operation, and the controller outputs corresponding control voltage signals to each air valve actuator according to the operation result to realize the opening adjustment of each air valve.
Compared with the prior art, the invention has the beneficial effects that: in the working condition of the transitional season, the control strategy of each air valve is changed, the opening degree of each air valve of the air handling unit is larger than that of the air valve in the known control method on the premise of meeting the control of the return air temperature, so that the air resistance of the system is reduced, the air pressure of the system is reduced, the energy consumption of the fan is reduced, the air-conditioning system is suitable for temperature control of most air handling units in the working condition of the transitional season, and the aim of saving energy is fulfilled by reducing the air resistance of the system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a control flow diagram of the present invention;
FIG. 2 is a control characteristic curve of each damper of a known air handling unit during a transition season operating condition;
FIG. 3 is a graph of control characteristics of each damper of the air handling unit of the present invention during a transition season;
FIG. 4 is a comparison of the control characteristics of the return air valve of the present invention with a known return air valve;
FIG. 5 is a comparison of the control characteristics of the fresh air valve of the present invention with a conventional return air valve;
FIG. 6 is a graph comparing the control characteristic of the exhaust valve of the present invention with a conventional return air valve;
FIG. 7 is a schematic diagram of an automated control system according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a fresh air duct; 2. a fresh air valve; 3. filtering with a screen; 4. a heater/cooler; 5. a blower; 6. a room; 7. an exhaust duct; 8. a wind pipe temperature sensor; 9. a return fan; 10. an exhaust valve; 11. a return air duct; 12. a return air valve; 13. a controller; 14. a fresh air valve actuator; 15. an exhaust valve actuator; 16. a return air valve actuator; 17. a differential pressure switch; 18. a two-way electric control valve; 19. and a control box.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: the stage temperature control method of each air valve of the air handling unit in the working condition of transition season averagely divides the range from the set value of the return air temperature of the air handling unit to the maximum value of the return air temperature of the adjustable area of the air valve into two sections, and when the return air temperature deviates from the set value and appears in the two different sections, different control methods are carried out on the fresh air valve, the exhaust valve and the return air valve.
As shown in fig. 1: the control method comprises
Stage 1: when the return air temperature value deviates from the set value and appears in a section between the set value and the staged control value, the maximum opening degree of the return air valve 12 is kept unchanged, and the opening degree of the fresh air valve 2 is adjusted to keep the return air temperature constant;
and (2) stage: when the return air temperature deviates from the set value and occurs in the section between the staged control value and the maximum return air temperature of the adjustable zone of the air valve, the fresh air valve 2 is maintained fully open, and the return air temperature is maintained constant by adjusting the return air valve 12.
FIG. 2 is a control characteristic curve of each air valve of a known air handling unit during a transition season operating condition. In the figure, the set value t of the return air temperature is within the change range of the return air temperature of the adjustable area of the air valve1Initially, as the deviation increases, the opening of the fresh air valve 2 increases proportionally (the exhaust valve 10 follows to maintain the indoor micro-positive pressure), the opening of the return air valve 12 decreases proportionally to the maximum value t of the return air temperature adjustable by the air valve3When the fresh air valve 2 is fully opened, the exhaust valve 10 is opened to the maximum, and the return air valve 12 is fully closed. And vice versa.
FIG. 3 is a control characteristic of each damper of the air handling unit of the present invention during a transition season operating condition. In the figure, the return air temperature variation range of the adjustable area of the air valve is averagely divided into 2 sections, and different control strategies are implemented on the air valve according to the return air temperature deviation and the section where the return air temperature deviation occurs: stage 1-when the return air temperature deviates from the setpoint and is at setpoint t1To a staged control value t2In the meantime, the maximum opening degree of the return air valve 12 is kept unchanged, and the fresh air valve 2 (followed by the exhaust valve 10) is adjusted to keep the return air temperature constant; stage 2-when the return air temperature deviates from the setpoint and occurs at a staged control value t2Maximum value t of return air temperature of adjustable area of air valve3In the middle, the fresh air valve 2 is kept fully opened, the exhaust valve 10 is kept at the maximum opening degree, and the return air valve 12 is adjusted to keep the return air temperature constant.
FIG. 4 is a graph comparing the control characteristics of a known return damper 12 and a return damper 12 of the present invention during a transient season condition of an air handling unit. In the figure, the opening degree of the return air valve 12 of the invention is larger than that of the known return air valve 12 within the return air temperature variation range of the adjustable area of the air valve, so that the wind resistance of a return air loop is reduced.
FIG. 5 is a graph comparing the control characteristics of a known fresh air valve 2 and a fresh air valve 2 of the present invention during a transient season operating condition of an air handling unit. In the figure, in the return air temperature variation range of the adjustable area of the air valve, the opening degree of the fresh air valve 2 is larger than that of the known fresh air valve 2, so that the air resistance of a fresh air loop is reduced.
FIG. 6 is a graph comparing the control characteristics of a known exhaust valve 10 and an exhaust valve 10 of the present invention during a transient season operating condition of an air handling unit. In the figure, in the return air temperature variation range of the adjustable area of the air valve, the opening degree of the exhaust valve 10 of the invention is larger than that of the known exhaust valve 10, and the air resistance of an exhaust loop is reduced.
Fig. 7 is a system diagram of an embodiment of the present invention. The automatic control system comprises a fresh air system, an exhaust system and a return air system, wherein the fresh air system comprises a fresh air valve 2, a filter screen 3, a heater/cooler 4 and a blower 5 which are sequentially arranged in a fresh air pipeline 1, fresh air enters the fresh air pipeline 1 under the action of the fresh air valve 2 and is sent into a room 6 through the blower 5 after being processed by the filter screen 3 and the heater/cooler 4, the exhaust system comprises an air pipe temperature sensor 8, a return air fan 9 and an exhaust valve 10 which are sequentially arranged in the exhaust pipeline 7, under the action of the exhaust valve 10, exhaust air in the room 6 is exhausted out of the room 6 through the exhaust pipeline 7 and the return air fan 9, the return air system comprises a return air valve 12 arranged in the return air pipeline 11, two ends of the return air pipeline 11 are respectively connected between the fresh air pipeline 1 and the pipeline 7, and exhaust air flows back into the fresh air system through the return air pipeline 11 under the action of the return air valve 12, the automatic control system also comprises a controller 13, the controller 13 controls the fresh air valve 2 through a fresh air valve actuator 14, an exhaust valve actuator 15 and a return air valve actuator 16 respectively, an exhaust valve 10, an air return valve 12 is opened and closed, the controller 13 detects the blockage of the filter screen 3 through a pressure difference switch 17, the controller 13 controls the opening degree of the heating/cooling device 4 through a two-way electric regulating valve 18, the controller 13 controls the return air machine 9 and the air feeder 5 through a control box 19 respectively, and the controller 13 detects the return air temperature signal t in the return air pipeline 11 through an air pipe temperature sensor 8.
Under the working condition of a transition season, the cold/hot water valve CV-1 is closed, the control requirement of the environment on the temperature is met only by fresh air or the mixture of the fresh air and partial return air, a return air temperature value is picked up by a return air temperature sensor TS-1 and is respectively compared with a set value and a staged control value of the return air temperature, a corresponding control strategy is implemented according to the comparison result, namely, stage 1 control or stage 2 control, namely, a return air temperature signal t is collected by an air pipe temperature sensor 8 and is substituted into a control output and return air temperature relational expression of the fresh air valve 2, the exhaust valve 10 and the return air valve 12 for operation, and a controller 13 outputs corresponding control voltage signals to each air valve actuator according to the operation result to realize the opening adjustment of each air valve.
Example one
If a certain air handling unit is operated in a cold supply transition season, the set value of the return air temperature is 24 ℃, namely t1The maximum value of the return air temperature of the adjustable area of the air valve is 26 ℃ at 24 ℃, namely t3The control output at the minimum opening of the exhaust valve 10 is 1V, i.e., O, at 26 ℃1The control output of the fresh air valve 2 at the minimum opening degree is 2V (O) 12The control output at the maximum opening of the return valve 12 is 8V, i.e., O, when it is 23When the exhaust valve 10 is opened to the maximum, the output of the controller 13 is 9V, i.e., O4When t is equal to 9, t is1To t3Division into t1To t2And t2To t3Two sections, and having t2At 25 ℃. The relationship between the output of various valve controllers 13 and the return air temperature is respectively substituted into the following formulas:
the control output of the return air valve 12 is as follows:
(t) 8, when (24 ℃ C. ≦ t < 25 ℃ C.)
f (t) is 208-8t (25 ℃ C. ≦ t ≦ 26 ℃ C.)
The control output of the fresh air valve 2 is as follows:
f (t) 8t-190 (24 ℃ C. t. less than or equal to 25 ℃ C.)
f (t) 10, when (25 ℃ < t ≦ 25 ℃)
The control output of the exhaust valve 10 is as follows:
(t) 8t-191, (24 ℃ C. ≦ t ≦ 25 ℃ C.)
(t) 9, when (25 ℃ < t ≦ 26 ℃)
The automatic control system collects the return air temperature t and substitutes the return air temperature t into the relational expression to carry out operation, and the controller 13 outputs corresponding control voltage signals to each air valve actuator according to the operation result to adjust the opening of the corresponding air valve.
Expressed by fan power P-MHx 103/(η×ηc) It can be known that (where M is the air volume, H is the air pressure, eta is the transmission efficiency of the fan, eta iscFor the efficiency of the fan), because the opening of each air valve is increased, on the premise that the air quantity M is not changed, the wind resistance of the system is reduced, the wind pressure H is reduced along with the reduction, and the power (energy consumption) of the fan is reduced.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (4)

1. The stage type temperature control method of each air valve of the air handling unit in the working condition of the transition season is characterized in that: the range from the set value of the return air temperature of the air handling unit to the maximum value of the return air temperature of the adjustable area of the air valve is evenly divided into two sections, when the return air temperature deviates from the set value and appears in two different sections, different control methods are carried out on the fresh air valve, the exhaust valve and the return air valve,
the control method comprises
Stage 1: when the return air temperature value deviates from the set value and appears in a section between the set value and the staged control value, the maximum opening degree of the return air valve is kept unchanged, and the opening degree of the fresh air valve is adjusted to keep the return air temperature constant;
and (2) stage: when the return air temperature deviates from the set value and appears in a section between the staged control value and the maximum return air temperature of the air valve adjustable area, the fresh air valve is kept fully open, the return air temperature is kept constant by adjusting the return air valve,
in the control method, the exhaust valve is adjusted along with the fresh air valve, and keeps a certain opening difference with the fresh air valve, so that the micro-positive pressure in a room is maintained.
2. The method of claim 1, wherein the method comprises the steps of: the relational expression of the control output of the fresh air valve, the exhaust valve and the return air temperature is
The control output of the return air valve is as follows:
f(t)＝O3when (t)1≤t＜t2)
Figure FDA0002887013310000011
When (t)2≤t≤t3)
The control output of the fresh air valve is as follows:
Figure FDA0002887013310000012
when (t)1≤t≤t2)
f (t) 10, when (t)2＜t≤t3)
The control output of the air exhaust valve is as follows:
Figure FDA0002887013310000013
when (t)1≤t≤t2)
f(t)＝O4When (t)2＜t≤t3)
Wherein t is the actual value of the return air temperature, t1Is the set value of the return air temperature t3Is the maximum value of the return air temperature t of the adjustable area of the air valve2Is defined as a phased control value and has t2-t1＝t3-t2，t、t1、t2、t3In degrees Celsius, O1Is the control output value O at the minimum opening of the exhaust valve2Is the control output value O when the opening of the fresh air valve is minimum3For controlling the output value, O, when the opening of the return air valve is at its maximum4Is the control output value when the opening of the exhaust valve is maximum, 10 is the control output when the fresh air valve is fully opened, and O1、O2、O3、O4And 10 in volts.
3. The method of claim 1, wherein the method comprises the steps of: and the automatic control system implements the relationship between the fresh air valve, the exhaust valve, the return air valve and the return air temperature.
4. The method of claim 3, wherein the method comprises the steps of: in the automatic control system, a return air temperature signal t is acquired through a return air pipe temperature sensor and substituted into a relational expression of control output of a fresh air valve, an exhaust valve and a return air valve and return air temperature to carry out operation, and a controller outputs corresponding control voltage signals to each air valve actuator according to an operation result to realize the opening adjustment of each air valve.
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Address before: The 7th and 8th floors of scientific research business building, No.1, North Yili, Renmin Road, Xingning District, Nanning City, Guangxi Zhuang Autonomous Region

Patentee before: GUANGXI SUZHONG DAKE INTELLIGENT ENGINEERING CO.,LTD.

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